Tractor



FIG. 1 is a front perspective view of a tractor showing our new design;

FIG. 2 is a right side view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a bottom view thereof;

FIG. 6 is a front view thereof;

FIG. 7 is a rear view thereof; and,

FIG. 8 is an enlarged view of a portion of the tractor showing our new design.

The broken lines in the Figures show portions of the tractor that form no part of the claimed design.

The oblique shade lines in the Figures show transparency or translucency. 

CLAIM The ornamental design for a tractor, as shown and described. 